Patch for slow smbclient performance

[Greg Dickie]

I must admit I havenot looked at the patch but is there any chance that
its affecting the TCP window size? In a switched enviroment where there is
no collision domain but there can be retransmissions, having a smaller
window size could substantially affect how much data would be
retransmitted for an error. Of course I would expect the change to be
linear in that case.... Maybe Microsoft just did a really bad job when
they "invented" MS TCP/IP ;-)

Greg


---------------------------------------------------------------------
Greg Dickie
Just A Guy*
*from discreet (the logic is gone)
Montreal 
(514) 954-7171
greg at discreet.com


On Thu, 24 Jun 1999, David Collier-Brown wrote:

> James Turner wrote:
> > Below is a patch against samba 2.0.4b that adds a switch to
> > smbclient.  I've found that using smbclient to access some Win95
> > machines is incredibly slow -- 10k/second or worse.  The problem
> > doesn't seem to occur when the access occur through smbd.  Using
> > strace and gdb revealed the problem to be in the network read/write
> > size.  This patch sets it ot be configurable via '-b'.
> > 
> > Experimentation has shown some quite peculiar results.  Basically the
> > breakpoint is around 1200 bytes for -b.  Above it, and you get
> > 10k/sec.  Below and you get 400-900k/sec(!).  It's not a continuous
> > change; it's quite a jump for a change in one byte.  I don't know what
> > value this might have for fixing the poor Win98 performance, but it
> > would seem that Win95 has problems with some patch sizes.
> 
> 	Cool!
> 	In smbclient, this eventually changes the size of an fread on
> 	the socket...  anyone have an idea why reducing from 65520
> 	to 1200 would make a Poisonus Computer perform better?
> 
> --dave
> --
> David Collier-Brown,  | Always do right. This will gratify some people
> 185 Ellerslie Ave.,   | and astonish the rest.        -- Mark Twain
> Willowdale, Ontario   | http://java.science.yorku.ca/~davecb
> Work: (905) 477-0437 Home: (416) 223-8968 Email: davecb at canada.sun.com
>